But what if the mirror remained fixed in place? Or, more specifically, what if the mirror was a semi-transparent variety, which let most of the light through but reflected about one third of that light up to some autofocus sensors?
That would solve two of the biggest problems with most other SLRs that try to shoot video:
1) you would now be able to add fast autofocus while you’re shooting video, and
2) you would be able to shoot many more frames-per-second (12 in the case of the A57) than what a consumer-grade moving mirror would normally be able to allow. AND you wouldn’t have to give up autofocus in this mode! The Single Lens Translucent (SLT) was conceived to give you a full-time Live View function with no compromises.
Another great advantage of this fixed mirror is that the dirt tends to stay on the mirror
and never gets to the sensor. Yes, this is actually better for two reasons: 1)
it’s much easier to clean dust off the mirror because it’s much easier to see, and 2) even with dust on your mirror you would
not see dust spots on your pictures.
Bron: Gary Friedman: the complete guide to sony A65
Bron: Gary Friedman: the complete guide to sony A65
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